/**
 * APITable <https://github.com/apitable/apitable>
 * Copyright (C) 2022 APITable Ltd. <https://apitable.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import { UndoManager } from './undo_manager';
import LRU from 'lru-cache';

export class UndoManagerStash {
  private stash: LRU<string, UndoManager>;

  constructor() {
    this.stash = new LRU(5);
  }

  public setStash(resourceId: string, undoManager: UndoManager) {
    this.stash.set(resourceId, undoManager);
  }

  public getStash(resourceId: string): UndoManager {
    let undoManager = this.stash.get(resourceId);
    if (!undoManager) {
      undoManager = new UndoManager(resourceId);
      this.setStash(resourceId, undoManager);
    }
    return undoManager;
  }

  public destroy() {
    this.stash.reset();
  }
}